Chelsea are said to be monitoring the situatuion surrounding Belgium midfielder Axel Witsel in case they miss out on their main target.
The Stamford Bridge club are pressing to sign Radja Nainggolan but, with Roma rebuffing all offers so far, Chelsea have discussed a move for his Belgium team-mate Witsel instead, although they would face big competition from Everton.
The Zenit St Petersburg player has been on show in France at the Euro finals with Belgium but they are now out courtesy of a 3-1 defeat to Wales and he will consider his next move.
He has a year left on his contract in Russia so they may be willing to sell him now rather than for nothing next season. He cost the club £15m when he signed from Benfica in 2012.